SM Split AH/AV Air Handler
SM Split AH/AV Air Handler8733826256 (2020/06)
8 | Installation
Subject to change without prior notice
Air Handler Section Installation
The air handler section may be installed on any
level surface strong enough to support its weight.
When installed in a closet or on a base stand, it
should be mounted on a vibration absorbing pad
slightly larger than the base to minimize vibration
transmission to the building structure.
Fig. 4 Vibration Pad
When installed in an attic or above a drop ceiling,
the installation must conform to all local codes.
Use the Hanging Bracket Kit to install the unit in a
horizontal position (supply air at the end or side of
the unit). The unit must be supported on all four
corners with threaded rods attached to the
building’s ceiling rafters.
Some applications require an attic floor
installation of the air handling unit. In this case the
unit should be set in a full-size secondary drain pan
on top of a vibration absorbing mesh. The
secondary drain pan prevents possible condensate
overflow or water leakage damage to the ceiling.
The secondary drain pan is usually placed on a
plywood base isolated from the ceiling joists by
additional layers of vibration absorbing mesh. In
both cases, a 3/4" drain connected to this
secondary pan should be run to an eave at a
location that will be noticeable. See Fig. 9.
If the air handler is located in a crawl space, the
bottom of the unit must be at least 4" above grade
to prevent flooding of the electrical parts due to
heavy rains.
Hanging Bracket Kit
All horizontal air handler units come with a
Hanging Bracket Kit to facilitate suspended unit
mounting using threaded rods.
Included Parts
Table 1 Hanging Bracket Kit Included Parts
Required Parts Not Included
The following are needed and are to be field
provided.
Table 2 Hanging Bracket Kit Field-Provided Parts
Installation Instructions
1. Remove and discard factory-provided screws
from the locations where hanging brackets will
be installed. See Fig. 5.
Fig. 5 Screw Locations
Vibration Pad
is
recommended
WARNING: Follow all applicable codes and
requirements when hanging this unit,
selecting threaded rod material, etc.
Quantity Description
5
Brackets
5
Rubber Vibration Isolators
8
Screws #10 x 1/2”
Quantity Description
4
Threaded Rods (3/8” maximum
diameter)
4
Hex Nuts
4
Washers (1–3/4” minimum O.D.)
Note: Additional fasteners specific to your
installation will be needed to attach the
threaded rods to the building’s rafters.
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